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The Ritzy Cinema in Brixton posted “David Bowie, Our Brixton Boy. RIP” on their entrance, as fans gather to pay tribute to the musician.

Fans have also been leaving postcards, flowers and paintings at the famous Brixton mural of the singer.

Fans have turned out in the hundreds at the mural, to pay tribute to the late star. (Michael Pitt) ()

Blackstar is expected to rocket to No.1 in the charts; 16 of his previous records have already climbed to the top 40 on iTunes' downloads chart.

If successful, Blackstar will be Bowie's 10th chart-topping album.

The film clip for his final single, Lazarus, which was released at the same time as Blackstar, is being hailed as a secret farewell message from the singer who knew he was dying.

"Look up here, I'm in heaven," Bowie sings on the track.

The London suburb of Brixton is mourning the loss of one of their most loved. ()

Mourning fans have begun placing tributes at a mural of the singer in the make-up of his most famous character, Ziggy Stardust, which is outside his childhood home in the southwest London district of Brixton.

His ex-wife Angie Bowie, who he divorced in 1980 after 10 years of marriage, is a contestant in the UK show Celebrity Big Brother and was not immediately told of her former husband's death.

After being told off-camera by the show's producers, the mother of Bowie's son Duncan decided to stay in the house, the broadcaster Channel 5 confirmed.

"She has taken the decision to continue in the programme. The decision to remain in the house is entirely her choice, and she has been given the option to leave at any time if she changes her mind."

Angie Bowie said on the reality show last week that she hadn't seen her ex-husband in about 40 years.

"I go to great lengths to avoid him," she said.

Some as-yet-unverified reports suggest that the legendary music icon, who suffered a heart attack in 2004, may have had other coronaries in the past 18 months.

David Bowie with his wife Angie Bowie on January 01, 1974 in London. (Getty) (Getty)

'He had six heart attacks in recent years - I got this from somebody very close to him, Wendy Leigh, who published a biography of the star in 2014, told BBC News.

Countless entertainers have shared their sorrow online, while British Prime Minister David Cameron has led tributes from world leaders, praising Bowie as a creative genius.

"I grew up listening to and watching the pop genius David Bowie. He was a master of reinvention, who kept getting it right. A huge loss," Mr Cameron said.

The German Foreign Office praised Bowie as having helped bring down the Berlin Wall in 1989.

"Good-bye, David Bowie. You are now among Heroes," the government department posted from its official Twitter account.

"Thank you for helping to bring down the wall."

Also paying tribute was the European Space Agency's Rosetta Mission shared a space-related tribute to the singer.